Just posted this in 'ttc after mc', but thought it would be helpful to post here too..
I believe the steroid treatment is controversial. After my fourth m/c I went to a private guy on Harley Street (Dr Shehata) for all the blood tests, and the only thing that came back abnormal was my level of natural killer cells, which he (and a few others) reckon can attack the placenta as a foreign body. It's essentially an over-active immune system. (A study is being carried out at Liverool hospital into this, too0>
He prescribed steroids to calm down the pesky NK cells. I took them as instructed in my next pregnancy, but miscarried at 11 weeks. However, as it turns out that the baby had trisomy 13, I don't know whether the steroids would have helped or not. Like you, however, I have no other option, so should I get pg again will take them, as they have no adverse side-effects.
However, non-steroid-believers say that
a) it's the number of NK cells in the uterus that matter, not the blood stream, and only a biopsy can tell you that
and
b) the number of NK cells in the blood varies daily, so blood tests are not an accurate indicator.
BUT I know a lady who'd had five mcs then had a successful pg after taking Mr Shehata's steroids, so there may be something in it. NHS doctors can be very dismissive of it, but it may just be a pioneering new treatment that in a few years will be standard practice. And it doesn't do any harm in the meantime...